[mythtv-users] TFW, Error: Write() -- IOBOUND ..... and mythbox crashed

[Ma Begaj]

and ...

it crashed again ...  changing scheduler did not help ...
It started with IOBOUND errors for a few seconds half of minute and
the system freezed.

I think I will get a 500gb SATA disk tomorow and move all recordings
on the new disk. Unless I get some ideas from you how to solve this
:).

M.




2007/10/18, Ma Begaj <derliebegott at gmail.com>:
> DMA was always on ...
>
> I tried something else ... I changed the IO scheduler in kernel from
> Anticipatory to Deadline and changed the number of requests to 1024:
>
> echo deadline > /sys/block/hda/queue/scheduler
> echo 1024 > /sys/block/hda/queue/nr_requests
>
> I started at the same time:
> three recordings, mythcommflagging, transcoding and one watching recording.
>
> I still get IOBOUND errors, but machine is not crashing ... hdparm -tT
> is not giving better performance.  Changing scheduler helped maybe a
> little bit, but it is not a solution.
>
> Should my disks be faster? They are both on one IDE cable as master and slave.
>
> Thanks.
>
> M.
>
>
>
> 2007/10/18, William Munson <william_munson at bellsouth.net>:
> > Ma Begaj wrote:
> > > Hi,
> > >
> > > I had yesterday three recordings running at the same time (1x pvr150,
> > > 1x pvr500). At the same time, I was watching a recording. And suddenly
> > > my mythbox crashed and I had to reset it.
> > >
> > > I checked syslog and found nothing, but I found something in
> > > mythbackend log file:
> > >
> > > 2007-10-17 23:32:05.673 TFW, Error: Write() -- IOBOUND begin cnt(2048) free(835)
> > > 2007-10-17 23:32:10.724 TFW, Error: Write() -- IOBOUND end
> > > 2007-10-17 23:32:10.731 TFW, Error: Write() -- IOBOUND begin cnt(2048)
> > > free(1095)
> > > 2007-10-17 23:32:10.735 TFW, Error: Write() -- IOBOUND end
> > > 2007-10-17 23:47:10.183 TFW, Error: Write() -- IOBOUND begin cnt(2048)
> > > free(1503)
> > >
> > > I checked the older mythbackend logs and I found more of these
> > > messages in the last few days, usually when I had 2-3 recordings (SD)
> > > running and watching at the same time.
> > >
> > > I have two IDE hard disks (2x 160GB WD) and 1GB single channel RAM.
> > > One of these disks has a system and home partitions and a partition
> > > for myth recordings. 2nd disk is only one partition for recordings.
> > > Everything is ReiserFS. I was thinking to change it to XFS these days.
> > >
> > >
> > > I run "hdparm -tT" and they are more or less the same for both disks:
> > > root at mythbox:/tmp# hdparm -Tt /dev/hd[ab]
> > >
> > > /dev/hda:
> > >  Timing cached reads:   1332 MB in  2.00 seconds = 666.17 MB/sec
> > >  Timing buffered disk reads:  136 MB in  3.03 seconds =  44.81 MB/sec
> > >
> > > /dev/hdb:
> > >  Timing cached reads:   1090 MB in  2.00 seconds = 545.26 MB/sec
> > >  Timing buffered disk reads:  172 MB in  3.02 seconds =  56.97 MB/sec
> > >
> > > not pretty fast? this
> > > http://readlist.com/lists/mythtv.org/mythtv-users/7/39724.html has the
> > > same problem, and the disks have two or almost three times higher
> > > "Timing cached reads".
> > >
> > > any ideas? I could buy new disk(s), but I think that these disks
> > > should be handle 2-3 recordings and 1 reading at the same time.
> > >
> > > Thanks
> > >
> > http://www.mythtv.org/wiki/index.php/Optimizing_Performance
> >
> > check out the section on hard disk DMA.
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
>
>
> --
> Glauben heißt nicht wissen wollen, was wahr ist ... Nietzsche
>


-- 
Glauben heißt nicht wissen wollen, was wahr ist ... Nietzsche